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目前国内大力开展增产节约,如何利用现有设备提高单位面积生产率是有重要意义的.在铸造生产中,尤其是在重型机器制造业的铸造生产中,大型铸件一般是采用地坑造型.在地坑中铸件浇注后冷却时间一般在40~100小时,更大的铸件需要10~20天.即使经过这样长的冷却时间,铸件的温度仍旧较高,并且铸件上部和下部有温度差,会使铸件产生挠曲,同时也增加了铸件的内应力.这样就可能引起铸件加工后变形而影响机器的
At present, it is of great significance to vigorously increase production and save in China and how to use existing equipment to improve productivity per unit area.In the casting production, especially in heavy machinery manufacturing, large castings are generally pit-formed Casting pits in the pit cooling time is generally 40 to 100 hours, larger castings take 10 to 20 days. Even after such a long cooling time, the casting temperature is still high, and the lower part of the casting temperature difference, will make Casting deflection, but also increased the internal stress of the castings.This may cause deformation of the castings after processing affect the machine